<?php
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

class NullableTypes {

    private ?mixed $mixed;
    private ?null $null;
    private ?false $false;
    private ?true $true;

    public function returnMixed(): ?mixed {
    }

    public function returnNull(): ?null {
    }

    public function returnFalse(): ?false {
    }

    public function returnTrue(): ?true {
    }

    public function parameterMixed(?mixed $mixed) {
    }

    public function parameterNull(?null $null) {
    }

    public function parameterFalse(?false $false) {
    }

    public function parameterTrue(?true $true) {
    }
}
